Just before ordering a 320W for a new office my Cisco reseller told me that because of dial pattern issues that the 320W has to be configured for all analog lines, or all SIP lines.
It's appearently not possible have both at the same time.
I decided to go with all analog lines for now, but this was a big disappointment. I can't afford the 500 series device that was recommended.
I got to wondering, if dial patterns are the issue could a 320W be configured to accept incoming calls from a SIP connection, but not dial out at all on it? That would work fine for our operation.
Is there any plan to update the 320W firmware to support this feature? If such an update is not planned, Cisco really should update the 320W data sheet to make this limitation clear. Both me and my reseller didn't realize this was a problem until very late in the game.